In 1984 an Occupational Pathology Center for 30 patients opened in Tchuvash Republic; since 1989 the Center was given a right to certify primary diagnosis of an occupational disease. Occupational morbidity structure in Tchuvash Republic corresponds to that in Russia, but the morbidity level in Tchuvash Republic is slightly lower than that in Russia. The Occupational Pathology Center in Tchuvash Republic served as an object of experiments in elaboration of occupational regulation parameters.